138667042 has 4 divisors (see below), whose sum is σ = 208000566. Its totient is φ = 69333520.

The previous prime is 138667033. The next prime is 138667093. The reversal of 138667042 is 240766831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 105247081 + 33419961 = 10259^2 + 5781^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138666992 and 138667010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34666759 + ... + 34666762.

Almost surely, 2^138667042 is an apocalyptic number.

138667042 is a deficient number, since it is larger than the sum of its proper divisors (69333524).

138667042 is an equidigital number, since it uses as much as digits as its factorization.

138667042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69333523.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 138667042 is about 11775.6970918923. The cubic root of 138667042 is about 517.5962054408.

The spelling of 138667042 in words is "one hundred thirty-eight million, six hundred sixty-seven thousand, forty-two".